The YSS Phantom is a Super Eikan-class Heavy Cruiser built at Chiharu no Iori by Ketsurui Fleet Yards in YE 32 for the Star Army of Yamatai's Second Expeditionary Fleet. She is commanded by Taii Tachibana Hayate, and serves as Task Force Phantom's command ship.
The Phantom serves as the current backdrop for the Task Force Phantom plot. The information provided her is for when Task Force personnel are aboard the Phantom.